Echoing an argument that has repeatedly been made by Fox News senior judicial analyst Judge Andrew Napolitano, Trump Jr. pointed out that any slight misstatement or slip-up by Trump could be construed as a lie to a federal official in a formal investigation, which is a felony.

"I wouldn't do it. I think it'd be stupid," Trump Jr. said. "It's not about collusion anymore. It's, 'Can we get him to say something that may be interpreted as somewhat off or inaccurate? And after 50,000 questions maybe you make a mistake, and that's how we get you.'"

He said the whole Russia investigation has devolved into an attempt to find something to undermine a duly elected president, which he said is "disgusting."

Former U.S. attorney and Fox News contributor Andy McCarthy said it’s “ridiculous” that some Democrats are complaining about Attorney General William Barr’s review of the origins of the Russia investigation.